docs: def get_cmd_handler(self, cmd):
          """
          Return an handler for cmd.
          The handler and the command should have the same name.
          See class description for more info about handlers.
  
          Args:
              cmd (str): The name of the command
  
          Returns:
              callable: which handles cmd
  
          Raises:
              lago.build.BuildException: If an handler for cmd doesn't exist
          """
          cmd = cmd.replace('-', '_')
          handler = getattr(self, cmd, None)
          if not handler:
              raise BuildException(
                  'Command {} is not supported as a '
                  'build command'.format(cmd)
              )
          return handler